Write MCA tags based on the specified sound field.

I had previously assumed that one should write MCA information into
the sound MXF based on what channels actually contain sound rather
than silence.

However a previous example of a stereo DCP gives a verification error
in EasyDCP (see DoM bug #1935) which is solved by adding MCA tags
for each channel in the specified sound field (e.g. at least 6 tags
for a file which is marked as 5.1) even if the audio is really stereo.

This commit removes the "active channels" stuff and makes sure
that if we say a file is 5.1 we write at least 6 MCA tags (and
similarly for 7.1).

1 files changed, 2 insertions, 2 deletions

diff --git a/src/sound_asset.cc b/src/sound_asset.cc
index 1c0a181f..fe0c5dd0 100644
--- a/src/sound_asset.cc
+++ b/src/sound_asset.cc
@@ -222,13 +222,13 @@ SoundAsset::equals (shared_ptr<const Asset> other, EqualityOptions opt, NoteHand
 
 
 shared_ptr<SoundAssetWriter>
-SoundAsset::start_write (boost::filesystem::path file, vector<Channel> active_channels, bool atmos_sync)
+SoundAsset::start_write (boost::filesystem::path file, bool atmos_sync)
 {
 	if (atmos_sync && _channels < 14) {
 		throw MiscError ("Insufficient channels to write ATMOS sync (there must be at least 14)");
 	}
 
-	return shared_ptr<SoundAssetWriter> (new SoundAssetWriter(this, file, active_channels, atmos_sync));
+	return shared_ptr<SoundAssetWriter> (new SoundAssetWriter(this, file, atmos_sync));
 }